5'utr - sequences on the 5' end of messenger rnas that are not translated into protein. 5'utr extends from the transcription start site to just before the atg translation initiation codon. This region contains the ribosome binding site and other transcription and translation regulating sequences.
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Source: Data courtesy of the U.S. National Library of Medicine. Since the data might have changed, please query MeSH on 5'utr for any updates.